KR101875077B1 - Seismic retrofit system using fire-resistant panel and construction method thereof - Google Patents

Abstract

The present invention relates to a seismic retrofit system using a fire-resistant panel and a construction method thereof. According to the present invention, the fire-resistant panel is immersed in flame retardant resin and a flame retardant coating agent is applied to the outside. As a result, the fire-resistant panel is protected during exposure to a fire, fire resistance improvement can be achieved, and a sudden fire transition can be effectively prevented. The seismic retrofit system using a fire-resistant panel according to the present invention includes an adhesive layer applied to the surface of a structure, in which a thermosetting adhesive is mixed with flame retardant inorganic powder; a fire-resistant panel attached to the outer surface of the adhesive layer, the fire-resistant panel being manufactured by drawing and immersion of a fiber reinforcement yarn in the flame retardant resin; and the flame retardant coating agent applied to the outer surface of the fire-resistant panel, containing water, expandable graphite, and a binder resin that is an ethylene-vinyl acetate copolymer. The fire-resistant panel comprises a panel main body formed of a resin-immersed glass fiber and an end piece protector surrounding both side ends of the panel main body in a U shape for protrusion beyond the upper and lower surfaces of the panel main body and formed of a resin-immersed carbon fiber.

Description

{Seismic retrofit system using fire-resistant panel and construction method}

The present invention relates to a fire-resistant reinforcement panel for protecting a fire-resistant reinforcement panel when exposed to a fire by applying a fire-retardant coating agent on the outside while impregnating the fire-resistant reinforcement panel with the fire retardant resin, thereby effectively improving fire resistance and effectively preventing a sudden transition of fire And a method of constructing the same.

Refractory reinforcement panels are often used to reinforce the strength, ductility, etc. of the structure and to improve the fire resistance of the structure.

Refractory reinforced panels are manufactured by impregnating fiber reinforcing fibers such as glass fiber or carbon fiber, which is a reinforcing material, with resin and can be manufactured by applying heat or pressure. They are used in various fields because they are lighter than steel plates and have excellent tensile strength.

The refractory-reinforcing panel can be manufactured by a drawing-forming method using the drawing and forming equipment 1 shown in FIG.

A method of manufacturing a refractory-reinforced panel using the drawing and forming equipment 1 of FIG. 1 is as follows.

First, a fiber reinforcing fiber such as glass fiber, carbon fiber, aramid fiber or the like is pulled from a winder 11 on which a fiber reinforcing fiber is wound, and impregnated with an epoxy resin or the like in a resin tank 13 through a guider 12. Then, the resin is removed from the guide mold 14 by a method such as squeezing to maintain the proper resin content, and then the resin is heated and cured in the heating mold 15 to manufacture the fire-resistant reinforcing panel 2 in strip form do.

At this time, the refractory-reinforced panel is continuously drawn and formed by the drawer 16 at the end of the equipment. In this process, the fiber reinforcing yarn at the side end is not sucked into the mold due to breakage or the like do.

In addition, there is an inconvenience in the handling of the refractory-reinforced panel after the production of the product.

On the other hand, since the refractory-reinforced panel uses epoxy resin, which is a petrochemical product, as a binder, toxic gas is generated due to burning of epoxy resin in case of fire, and the refractory reinforcement panel is dropped. Therefore, when the fire-resistant reinforcement panel is used in the structure, the flame and the heat should be blocked for a certain time to prevent the rapid spread of the fire.

KR 10-1534198 B1

In order to solve the above problems, the present invention provides a fireproof reinforcement panel capable of minimizing various human and material damages by delaying the generation of toxic gas even when a fire occurs when using a fireproof reinforcement panel, And a method of constructing the same.

The present invention provides an anti-seismic reinforcement system using a fire-resistant reinforcement panel and a construction method thereof, which can prevent a fiber reinforcement yarn located on a panel side from being broken during the manufacture of a fireproof reinforcement panel.

The present invention provides an anti-seismic reinforcement system using a fire-resistant reinforcement panel and a method of constructing the fire-reinforcement panel using the fire-resistant reinforcement panel.

According to a preferred embodiment of the present invention, there is provided an adhesive sheet comprising: an adhesive layer which is applied to a surface of a structure and in which a flame-retardant inorganic powder is mixed with a thermosetting adhesive; A fire-resistant reinforcing panel attached to an outer surface of the adhesive layer, the fire-reinforcing panel being manufactured by drawing a fiber reinforcing fiber into a flame retardant resin; And a flame retardant coating agent comprising an ethylene-vinyl acetate copolymer binder resin, expandable graphite and water, which is applied to the outer surface of the refractory-reinforced panel; Wherein the refractory-reinforced panel comprises a panel main body formed of glass fiber impregnated with resin, and both side ends of the panel main body are formed so as to protrude from upper and lower surfaces of the panel main body in a C-shape, And an eccentric protector formed of fiber. The present invention provides an anti-seismic reinforcement system using a refractory-reinforced panel.

According to another preferred embodiment of the present invention, the refractory-reinforced panel is constructed by connecting unit panels cut to a predetermined length with a joint member, wherein the joint members are formed with through-holes so that one ends of the unit panels are inserted at both ends, respectively And a pair of unit panels are inserted and fixed to both sides of the insertion part of the joint member, respectively.

According to another preferred embodiment of the present invention, there is provided an anti-seismic reinforcement system using a refractory-reinforced panel, wherein a protrusion is protruded inward from the center of the insertion portion of the joint member.

According to another preferred embodiment of the present invention, the unit panel is bent in a sectional shape corresponding to the external shape of the structure, and the joint member is formed in a shape corresponding to the unit panel. .

According to another preferred embodiment of the present invention, there is provided an anti-seismic reinforcement system using a fire-resistant reinforcing panel, wherein at least one row of grooves is longitudinally formed on one side or both sides of the panel main body of the refractory-reinforced panel.

According to another preferred embodiment of the present invention, there is provided a method of constructing an anti-seismic reinforcement system using the refractory-reinforced panel, comprising the steps of: (a) facetting a surface of a structure to be reinforced; (b) preparing a fire-resistant reinforcement panel by joining the unit panels with a joint member according to the length of the structure; (c) forming an adhesive layer by applying an adhesive to the surface of the structure and the refractory-reinforced panel; Reinforcing panel on the outer surface of the structure; And (e) applying a flame-retardant coating agent to the outer surface of the refractory-reinforced panel to cure the same; The present invention provides a method of constructing an anti-seismic reinforcement system using a refractory-reinforced panel.

The present invention has the following effects.

First, it is possible to protect the refractory-reinforced panel by improving the fire resistance when exposed to fire by impregnating the refractory-reinforced panel with the flame retardant resin and applying the flame retardant coating agent to the outside. As a result, it is possible to delay the transition of fire and effectively cope with the initial fire, thereby minimizing various human and material damages.

Second, both sides of the panel main body made of glass fiber are reinforced with carbon fiber without open-loop to form a wharf protection portion, so that the mold-hanging phenomenon can be prevented in the production of the refractory-reinforced panel. In addition, it is possible to eliminate difficulties in the handling and management due to the unfolding of the side of the refractory-reinforced panel during the use process.

Third, a fireproof reinforcement panel can be constructed by interconnecting unit panels cut to a certain length by a joint member. In this case, the logistics cost can be reduced by standard production of the member, and it is easy in terms of storage and on-site handling. In addition, since the unit panel can be manufactured in various sectional shapes according to the shape of the structure, it is excellent in field application.

Fourth, in the case where the protrusion is protruded inwardly at the center of the insertion part of the joint member, the insertion length of the unit panel on both sides of the joint member can be adjusted to prevent the overlapping length of the unit panel from becoming insufficient.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a drawing showing a drawing and forming apparatus for manufacturing a refractory-reinforced panel. FIG.
2 is a sectional view showing an anti-seismic reinforcement system using a fire-resistant reinforcement panel according to the present invention.
3 is a cross-sectional view showing an embodiment of a refractory-reinforced panel;
4 is a perspective view showing an embodiment of a unit panel joined by a joint member;
5 is a perspective view showing a coupling relationship between a unit panel and a joint member;
6 is a cross-sectional view showing a coupling relationship of a unit panel and a joint member formed with a projection;
7 is a perspective view showing another embodiment of a unit panel joined by a joint member;
8 is a cross-sectional view showing an embodiment of a refractory-reinforced panel applied to beams;
9 is a perspective view showing another embodiment of the refractory reinforcing panel.
10 is a cross-sectional view showing another embodiment of a fire-resistant reinforced panel bonded to a structure;

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

FIG. 2 is a sectional view showing an anti-seismic reinforcement system using the fire-reinforcement panel of the present invention, and FIG. 3 is a sectional view showing an embodiment of a fire-resistant reinforcement panel.

2 and 3, an anti-seismic reinforcement system using a refractory-reinforced panel according to the present invention includes an adhesive layer 4 coated on the surface of a structure 6 and having a thermosetting adhesive mixed with a flame-retardant inorganic powder; Reinforced panel (2) attached to the outer surface of the adhesive layer (4), the fiber reinforced panel being made of a fiber reinforced resin impregnated with a flame retardant resin and formed by drawing; And a flame-retardant coating agent (5) applied to the outer surface of the refractory-reinforcing panel (2), the binder resin comprising ethylene-vinyl acetate copolymer, expandable graphite and water; Wherein the refractory-reinforcing panel (2) comprises a panel body (21) formed of glass fiber impregnated with resin and both side ends of the panel body (21) are protruded from upper and lower surfaces of the panel body in a U- And a tail protection unit 22 made of carbon fiber impregnated with resin.

The adhesive layer 4 is applied to the surface of the structure 6 to adhere the refractory-reinforcing panel 2 to the surface of the structure 6, and the thermosetting adhesive is mixed with the flame-retardant inorganic powder.

The thermosetting adhesive is a two-part type composed of a base and a curing agent. The base and the curing agent may be mixed at a weight ratio of 2: 1.

The flame-retardant inorganic powder is a flame-retardant material as a filler and may be mixed at a ratio of 150 parts by weight to 100 parts by weight of the adhesive.

When the adhesive layer 4 is formed as described above, the adhesive strength of 7 MPa or more and the adhesive strength of a predetermined size or more can be maintained. In addition, compared to epoxy, the amount of harmful air substances such as formaldehyde, toluene, and benzene is low, and harmful gas is harmless to human body.

In addition, there is almost no odor and unlike general use of thermosetting adhesives alone, there is little foaming phenomenon and it is uniform.

The adhesive layer 4 can be applied by panel pressing after application of an adhesive, and can be applied by grouting injection after panel fixing according to circumstances.

The adhesive layer (4) needs a curing time of 24 hours after bonding. At this time, if the curing temperature is increased, the curing time can be shortened.

The refractory reinforcing panel 2 is attached to the outer surface of the adhesive layer 4 and is manufactured by impregnating the fiber reinforcing fiber with a flame retardant resin and drawing and forming.

The refractory-reinforcing panel 2 includes a panel main body 21 formed of glass fiber impregnated with a resin and a flange protector 22 formed to surround both side ends of the panel main body 21 and made of carbon fiber impregnated with resin, (22).

The fiber reinforcing members, that is, the glass fiber and the carbon fiber are supplied to the guide mold through the guider in the winder.

At this time, the carbon fibers are supplied from the left and right ends of the glass fiber for forming the edge protecting portion 22.

The glass fiber and the carbon fiber are impregnated with a resin in a resin tank and supplied to a guide mold.

The glass fiber and the resin impregnated in the carbon fiber may comprise melamine and phenol.

In order to prevent the rapid spread of fire in case of fire, it is necessary to improve the flame retardant performance by including phenol resin which is a thermosetting material. The phenol resin is more stable than a system using a resin such as epoxy or unsaturated polyester.

After the resin is removed to maintain the proper resin content in the guide mold, the refractory-reinforcing panel 2 is manufactured by heating and curing the resin in the heating mold, and the refractory-reinforced panel 2 is drawn and formed by a drawer.

The fire-resistant refractory panel 2 may be produced in the form of a continuous roll and supplied or may be cut into a predetermined length and supplied.

The refractory-reinforced panel 2 can be produced in various widths.

In the production of refractory reinforced panel (2) having a width of about 100 mm, it is necessary to manufacture the refractory panel (2) having a width of about 600 mm in order to secure economical efficiency. It is preferable to use an interactive mat. Since the carbon fibers constitute both side ends of the panel body 21, they may be supplied to the roving yarn in one direction.

In the present invention, the edge of the panel body 21 made of glass fiber is wrapped and reinforced with a carbon fiber having a strength of 2 times or more and free from loosening to form the edge protecting portion 22.

The glass fiber generally has excellent durability, impact resistance, abrasion resistance, easy processing, and low thermal conductivity. However, the glass fiber is difficult to handle due to a large amount of loosening during use or during use.

On the other hand, carbon fiber has excellent elasticity and excellent tensile strength, so that it does not break or melt during drawing.

Therefore, the glass fiber is constituted of the main material of the refractory-reinforcing panel 2 to constitute the panel main body 21, and the edge protecting portion 22 made of carbon fiber is wrapped around the side end of the panel main body 21 in a U- So as to reinforce the side ends of the refractory-reinforcing panel 2.

Therefore, the effect of reinforcing the end portion of the refractory-reinforcing panel 2 is large, and the mold-hanging phenomenon can be prevented at the time of production, and the difficulty in handling due to end-

The flame-retardant coating agent (5) is applied to the outer surface of the refractory-reinforcing panel (2) to a certain thickness and comprises a binder resin, ethylene-vinyl acetate copolymer, expandable graphite and water.

The flame retardant coating agent (5) protects the fire-resistant reinforcement panel (2) when flame is exposed and prevents the transition of the fire to effectively cope with the initial fire.

The binder resin may be an ethylene-vinyl acetate copolymer which is easy to obtain because of its function as an adhesive, excellent in adhesiveness, cold resistance and transparency, and easy to obtain a stable emulsion.

The expandable graphite expands upon contact with a heat source to form an air layer between the heat source and the refractory reinforcing panel 2. The air layer has an effect of improving the flame retarding effect by suppressing heat transfer.

The water regulates the viscosity of the flame retardant coating (5).

The flame retardant coating agent (5) is composed of an inorganic material whose main component is resistant to fire, and has excellent heat resistance in a temperature range of 300 to 700 ° C.

In addition, when the flame is directly contacted, the coating film surface is foamed by 10 times or more to form a carbonized insulating layer (char).

At this time, the carbonized heat insulating layer made of an inorganic material prevents the fire from transferring and forms a shield for protecting the fire-resistant reinforcement panel 2 from the flame.

In particular, when the refractory-reinforced panel 2 is attached to the structure 6 with an organic adhesive, the carbonized heat insulating layer prevents a rapid increase in the temperature of the backside where the adhesive layer 4 is located, thereby delaying the time for thermal decomposition of the organic adhesive . This can delay the time required for the fire-resisting panel (2) to be removed from the structure (6).

In addition, the carbonized insulation layer blocks the noxious gas generated during the thermal decomposition of the adhesive layer 4, and has properties such as chemical resistance, insulation, and flame resistance. In addition, the polymer material is included and the adhesive strength is excellent.

The flame-retardant coating agent 5 may be applied to the surface of the refractory-reinforcing panel 2 by spraying, brushing, roller coating or the like to a thickness of 0.5 to 1 mm, followed by drying.

Since the flame-retardant coating agent (5) may cause dry cracking, adhesion failure or the like at the time of one application, it is preferably applied separately several times.

Fig. 4 is a perspective view showing an embodiment of a unit panel joined by a joint member, and Fig. 5 is a perspective view showing a coupling relationship between the unit panel and the joint member.

4 and 5, the refractory-reinforcing panel 2 is constructed by interconnecting unit panels 2a and 2b cut to a predetermined length by a joint member 3, A pair of unit panels 2a and 2b are formed on both sides of the insertion portion 31 of the joint member 3 so that one end of each of the unit panels 2a and 2b is inserted at both ends thereof, So that one end is inserted and fixed.

Generally, fire-proofing panel (2) is produced by drawing and forming in 100m unit, then rolled into rolls and brought into the field. Accordingly, the refractory-reinforcing panel 2 is cut and used for a required length in the field.

However, since the diameter of the roll exceeds 2 m, the distribution cost increases, and it is difficult to secure a space for storage, and it is difficult to handle the product on the spot.

Therefore, in order to solve such a problem, the fire-resistant reinforcing panel 2 is cut into a predetermined length in advance to manufacture unit panels 2a and 2b as standard products. In the field, the unit panels 2a and 2b are joint- So that they can be used.

The insert member 31 is inserted through the joint member 3 such that one end of each of the unit panels 2a and 2b is inserted into the joint member 3. The pair of unit panels 2a and 2b are inserted into the joint member 3, One end of which is inserted and fixed to both sides of the insertion portion 31 of the main body 31.

It is preferable that the insertion portion 31 of the joint member 3 is made somewhat more spacious than the end face of the unit panels 2a and 2b so that the end portions of the unit panels 2a and 2b can be inserted.

The unit panels 2a and 2b can be integrally fixed by filling an adhesive agent into the inserting portion 31 of the joint member 3. Or bolts or anchors may be fixed to each other by fastening the joint members 3 so as to pass through the respective end portions of the unit panels 2a and 2b.

The joint member 3 is preferably made of glass fiber, which is the same material as the panel body 21.

6 is a cross-sectional view showing a coupling relationship of a unit panel and a joint member formed with a projection.

As shown in FIG. 6, a protrusion 32 may protrude inward from the center of the insertion portion 31 of the joint member 3.

The protruding portion 32 may be configured to press a part or all of the center of the joint member 3 and protrude into the insertion portion 31.

When the unit panels 2a and 2b are inserted into the insertion portion 31 of the joint member 3 when one of the unit panels 2a and 2b is inserted too deeply, It can not be sufficiently inserted into the insertion portion 31, and the overlapping length with the joint member 3 becomes short.

The protruding portion 32 is formed at the center of the insertion portion 31 of the joint member 3 so that the unit panels 2a and 2b on both sides of the joint member 3 can be inserted only up to the protruding portion 32. [

Thus, the lengths of the two unit panels 2a and 2b overlapping with the joint member 3 can be the same.

Fig. 7 is a perspective view showing another embodiment of the unit panel joined by the joint member, and Fig. 8 is a sectional view showing an embodiment of the fire-proofing panel applied to the beam.

7, the unit panels 2a and 2b are bent in a sectional shape corresponding to the outer shape of the structure 6, and the joint members 3 are formed in a shape corresponding to the unit panels 2a and 2b .

The existing roll-type refractory-reinforced panel (2) could only be formed in the form of a flat plate.

On the other hand, when the refractory-reinforcing panel 2 is constructed of the unitized panels 2a and 2b, the unit panels 2a and 2b can be bent in various forms.

7 shows the unit panels 2a and 2b having a cross-sectional shape, but the present invention is not limited to this, and a bent angle can be freely adjusted or a cross-section having a U-shape can be used.

Accordingly, the refractory-reinforced panel 2 can be easily used for reinforcing the corner of the structure 6. [

For example, FIG. 8 shows a fire-proofing panel 2 using unit panels 2a and 2b bent in a L-shape so as to simultaneously cover the side surface and the bottom surface of the beam constituting the structure 6. [

Here, the structure 6 is covered by the plurality of refractory-reinforced panels 2, and each refractory-reinforced panel 2 is attached to the outer surface of the adhesive layer 4 applied to the surface of the structure 6, A flame-retardant coating agent (5) was applied to the outer surface.

Fig. 9 is a perspective view showing another embodiment of the refractory-reinforced panel, and Fig. 10 is a cross-sectional view showing another embodiment of the refractory-reinforced panel bonded to the structure.

9 and 10, at least one row of grooves 211 may be formed on one side or both sides of the panel body 21 of the refractory-reinforcing panel 2 in the longitudinal direction.

The groove portion 211 increases the contact area between the refractory reinforcing panel 2 and the adhesive layer 4 and the flame-retardant coating agent 5 to increase the adhesion.

Further, since the refractory-reinforcing panel 2 can be easily bent along the groove 211, the refractory-reinforcing panel 2 can be easily attached to an angled portion such as a corner of the structure as shown in Fig.

The grooves 211 may be formed on only one side of the panel body 21 or on both sides thereof.

A method of constructing an anti-seismic reinforcement system using the fire-reinforcement panel of the present invention is a method of constructing an anti-seismic reinforcement system using the fire-reinforcement panel of the present invention with reference to Figs. 2 to 10.

A method of constructing an anti-seismic reinforcement system using a refractory-reinforced panel according to the present invention comprises the steps of: (a) facetting a surface of a structure to be reinforced; (b) preparing the fire-proofing panel (2) by joining the unit panels (2a, 2b) with the joint member (3) according to the length of the structure (6); (c) forming an adhesive layer (4) by applying an adhesive to the adhesive surface of the structure (6) and the refractory-reinforcing panel (2); (d) squeezing and attaching the refractory-reinforcing panel (2) to the outer surface of the structure (6); (E) coating and curing the flame-retardant coating agent (5) on the outer surface of the refractory-reinforced panel (2); And a control unit.

The step (a) includes a planarizing operation of the outer surface of the structure 6 by removing the existing fire-resistant spray, a filling by putty, and a crack reinforcement work by epoxy injection.

In the step (b), an operation of selecting the size and number of the unit panels 2a and 2b required according to dimensions actually measured after the structure 6 to be reinforced is measured.

The unit panels 2a and 2b are filled with an adhesive in the insertion portion 31 of the joint member 3 and then inserted into the insertion portion 31 to be fixed. This completes the preparation of the fire-resisting reinforcement panel 2.

The flame retardant coating agent 5 applied in the refractory-reinforcing panels 2, the adhesive layers 4 formed in the step (c) and the step (e) is as described above in connection with the seismic strengthening system using the refractory- .

In the step (d), after the refractory-reinforcing panel 2 is attached, a plurality of portions may be drilled and an anchor such as a knife block may be inserted to fix the fire-proofing reinforcement panel 2.

It is possible to complete the construction of the reinforcement system in which the structure 6 is enclosed by the fireproof reinforcement panel 2 through the steps (a) to (e).

1: Drawing and forming equipment
11: Winder
12: Guider
13:
14: Guide mold
15: Heating mold
16: Drawer
2: Refractory reinforcing panel
2a, 2b: a unit panel
21:
211: Groove
22:
3: joint member
31:
32:
4: Adhesive layer
5: Flame retardant coating agent
6: Structure

Claims (6)

An adhesive layer (4) which is applied to the surface of the structure (6) and in which a flame-retardant inorganic powder is mixed with a thermosetting adhesive;
Reinforced panel (2) attached to the outer surface of the adhesive layer (4), the fiber reinforced panel being made of a fiber reinforced resin impregnated with a flame retardant resin and formed by drawing; And
A flame retardant coating agent (5) which is applied to the outer surface of the refractory-reinforcing panel (2) and contains binder resin, ethylene-vinyl acetate copolymerization, expandable graphite and water; Respectively,
The refractory-reinforcing panel 2 includes a panel main body 21 formed of glass fiber impregnated in a resin and both side ends of the panel main body 21 so as to protrude from upper and lower surfaces of the panel main body 21 in a U- (22) made of carbon fiber impregnated with a resin. The anti-seismic reinforcement system according to claim 1,
The method of claim 1,
The refractory-reinforcing panel 2 is constructed by interconnecting unit panels 2a and 2b cut to a predetermined length by a joint member 3, wherein the joint member 3 is formed by joining the unit panels 2a and 2b Wherein one end is inserted and fixed to both sides of the insertion portion (31) of the joint member (3), and a pair of unit panels (2a, 2b) are formed through the insertion portion (31) Seismic Retrofit System Using Reinforced Panels.
3. The method of claim 2,
Wherein a protrusion (32) protrudes inwardly from a center of an insertion portion (31) of the joint member (3).
3. The method of claim 2,
The unit panels 2a and 2b are bent in a sectional shape corresponding to the external shape of the structure 6 and the joint members 3 are formed in a shape corresponding to the unit panels 2a and 2b. Seismic Retrofit System Using Reinforced Panels.
The method of claim 1,
Wherein at least one or more rows of grooves (211) are formed longitudinally on one side or both sides of the panel main body (21) of the refractory reinforcing panel (2).
A method of constructing an anti-seismic reinforcement system using a fire-resisting reinforcement panel (2) according to any one of claims 2 to 5,
(a) facetting the surface of the structure 6 to be reinforced;
(b) preparing the fire-proofing panel (2) by joining the unit panels (2a, 2b) with the joint member (3) according to the length of the structure (6);
(c) forming an adhesive layer (4) by applying an adhesive to the adhesive surface of the structure (6) and the refractory-reinforcing panel (2);
(d) squeezing and attaching the refractory-reinforcing panel (2) to the outer surface of the structure (6); And
(e) coating and curing the flame-retardant coating agent (5) on the outer surface of the refractory-reinforced panel (2); Wherein the refractory reinforcement panel is made of a synthetic resin.

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